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Historic Preservation - Technical Procedures

Spectitle:

Installing Grouted Exterior Brick Pavers

Procedure code:

0252001R

Source:

Tacoma Union Station Courthouse - Tacoma, Wa

Division:

Sitework

Section:

Brick Pavers

Last Modified:

02/24/2012

Details:

Installing Grouted Exterior Brick Pavers



INSTALLING GROUTED EXTERIOR BRICK PAVERS


PART 1---GENERAL

1.01 SUMMARY

    A.   This procedure includes guidance on installing exterior
         brick paving and applying portland cement grout to
         replace deteriorated sections of existing paving and
         grout.

    B.   See 01100-07-S for general project guidelines to be
         reviewed along with this procedure.  These guidelines
         cover the following sections:

         1.   Safety Precautions

         2.   Historic Structures Precautions

         3.   Submittals

         4.   Quality Assurance

         5.   Delivery, Storage and Handling

         6.   Project/Site Conditions

         7.   Sequencing and Scheduling

         8.   General Protection (Surface and Surrounding)

         These guidelines should be reviewed prior to performing
         this procedure and should be followed, when applicable,
         along with recommendations from the Regional Historic
         Preservation Officer (RHPO).

1.02 REFERENCES

    A.   American Society for Testing and Materials (ASTM), 100
         Barr Drive, West Conshohocken, PA 19428, (610) 832-9585
         or FAX (610) 832-9555.

1.03 SUBMITTALS

    A.   Samples:

         1.   Submit samples of brick pavers showing full extent
              of colors and texture; samples shall be compared to
              existing face brick on building.

         2.   Submit grout color samples.

    B.   Product Data:  Submit product data on latex additives for
         grout and setting bed.

1.04 DELIVERY, STORAGE AND HANDLING

    A.   Protect masonry materials during storage and construction
         against wetting by rain, snow or ground water and against
         soilage or intermixture with earth or other types of
         materials.

1.05 PROJECT/SITE CONDITIONS

    A.   Protection:  Protect mortar bed and grout against uneven
         and excessive evaporation.  Cure as required by climatic
         and job conditions so as to achieve proper hydration.
         Provide suitable coverings, moist curing barriers, etc.
         as required.


PART 2---PRODUCTS

2.01 MATERIALS

    A.   Brick Pavers:  Pavers shall be solid, uncored, smooth
         units in color to match existing face brick color.  Units
         shall conform with requirements of ASTM C902, Class SX,
         Type 1, Application PS.

         1.   Not less than 10,500 psi average compressive
              strength.

         2.   Not more than 8 percent cold water absorption after
              24 hour submersion in cold water.

         3.   Size shall be as indicated on the drawings.

    B.   Setting Materials:

         1.   Portland Cement:  ASTM C150, Type I or II, of
              natural color or white, as required to produce the
              required color of grout.

         2.   Aggregate for Setting Bed:  Clean, fine sand
              conforming to ASTM C144, uniformly graded from
              coarse to fine with 100% passing the No. 4 sieve
              and not more than 5% passing the No. 100 sieve.

         3.   Aggregate for Grout:  Clean, fine sand conforming
              to ASTM C144, uniformly graded from coarse to fine
              with not more than 5% passing the No. 100 sieve;
              100% may pass the No. 30 sieve, but if the work
              requires a coarser sand, the coarse sieve size
              limit may be increased to the No. 16 size.

         4.   Latex Additive for Thick Bed Mortar and Grout:
              Laticrete International, Inc. "3701 Latex
              Additive", or approved latex material which is
              recommended for use in thick bed mortars and grout
              for exterior applications.

         5.   Color Pigments:  For colored grout, use natural and
              synthetic iron oxides and chromium oxides,
              compounded for use in grout mixes.  Use only
              pigments with record of satisfactory performance in
              masonry grouts.  Solomon Grind-Chem Services, Inc.
              "SGS Mortar Colors", Davis "True Tone Mortar
              Colors", or approved equal.

         6.   Water shall be clean, free of deleterious materials
              which would impair strength or bond.

         7.   Latex Additive for Bond Coat:  Laticrete
              International, Inc. "4237 Thin Set Mortar
              Additive", or approved.

2.02 MIXES

    A.   Setting Bed:  Proportions for setting bed shall be 1 part
         Portland cement, 3 parts sand with 50 percent latex
         additive and 50 percent water.  Sand shall be measured in
         damp, loose condition.  Use only enough latex additive
         and water to produce a moist surface when setting bed is
         ready for setting of paver units.

    B.   Bond Coat:  Consist of 1 part Portland cement, 1 part
         sand with 50 percent latex additive and 50 percent water,
         and color pigment.  Sand shall be measured in damp, loose
         condition.


PART 3---EXECUTION

3.01 EXAMINATION

    A.   Installer must examine the areas and conditions under
         which brick paving is to be installed.  Do not proceed
         with work until unsatisfactory conditions have been
         corrected in a manner acceptable to Installer.
         Commencement of work constitutes acceptance of surfaces.

3.02 ERECTION, INSTALLATION, APPLICATION

    A.   Paver Installation, General:

         1.   Do not use units with chips, cracks, voids,
              discolorations or other defects which might be
              visible or cause staining in finished work.

         2.   Cut units with motor-driven saw equipment designed
              to cut masonry with clean, sharp unchipped edges.
              Cut units as required to provide pattern shown and
              to fit adjoining work neatly.  Use full units
              without cutting wherever possible.

         3.   Set units in patterns shown with uniform joint
              width.

         4.   Maintain surface plane for finished masonry paving
              not exceeding a tolerance of 1/8" in 10 feet when
              tested with a 10 foot straightedge.

    B.   Portland Cement Application:

         1.   Spread and screed to uniform thickness, except for
              minor variations required to produce a true
              surface, level in plane or uniformly sloped for
              drainage as shown.  Cut back, bevel edge, remove
              and discard setting bed material which has reached
              initial set prior to placing of paver units.

         2.   Wet brick units several hours before laying, unless
              their gain in weight resulting from partial
              immersion flatware in 1/8" of water for 1 minute is
              less than 3/4 oz. per 30 sq. in. of immersed area.
              Do not lay bricks with free moisture on the
              surface.

         3.   When mortar bed is plastic, apply bond coat with a
              notched trowel to a uniform thickness of 1/32" to
              1/16".  Do not apply more mortar than can be
              covered within 20 to 30 minutes or before the
              surface has developed a skin.  Each paver unit
              shall be back buttered with mortar before setting.
              Tamp and beat paver units for a complete contact
              between pavers and setting bed.  Set and level each
              unit immediately.

         4.   Grout joints as soon as possible after initial set
              of setting bed.  Force grout into joints, taking
              care not to smear grout on adjoining paver units
              and other surfaces.  After initial set of grout,
              finish joints by tooling to produce a very slightly
              concave polished joint, free from drying cracks.
         5.   Cure grout by maintaining in a damp condition for 7
              days.

    C.   Repair and Pointing:

         1.   Remove and replace paver units which are loose,
              chipped, broken, stained or otherwise damaged, or
              if units do not match adjoining units.  Provide new
              units to match adjoining units and install in fresh
              mortar or grout, pointed to eliminate evidence of
              replacement.

         2.   Pointing:  During the tooling of joints, enlarge
              voids of holes and completely fill with mortar or
              grout.

                             END OF SECTION